I guess a lot of mixers have thought about that ... some like you are laying stocks down already. If you can afford it, why not, it's not like it degrades significantly when stored correctly.
I think I'll hold off until we hear something firmer. It does risk a run on nic as soon as availability or price is threatened, but I don't see the government springing a nasty overnight hike in a budget whilst the jury's still out on vaping more generally.
I'm also rethinking this strategy of reducing nic levels in my home made juice - it just makes me vape more. It's counter-productive. Maybe to reduce our overall daily nic intake we need to up our nic levels so that we vape less? Of course some would say they want to vape more, they enjoy it that much. Vaping is becoming a pasttime, taking up hours and hours of "spare" time, it's taking over from everything else in our lives ... I don't remember spending an entire evening smoking. So it's past the point of replacing the fags, it's replacing getting on with life.
Anyway, back on thread ... with all this nic laid down, how much finished juice do you have laid down? I reckon I could go 3 months without mixing another drop ... probably 2-3 months more with the bases I still have to mix.